<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>p3_元素阴影</title>
</head>
<style>
    div{
        width: 200px;
        height: 200px;
        background-color: #0aa1ed;
        border-radius: 100px;
                /*X轴偏移量 Y轴偏移量 羽化值 阴影半径 阴影颜色*/
        box-shadow: 8px     10px     18px    8px     black;
    }
</style>
<body>
    <div></div>
</body>
</html>